Does your keyboard have an external power supply? If so, try a new one........ if not, try plugging the keyboard into a UPS (uninterruptible power supply, you know, those things your computer SHOULD be plugged into). At this time of year, so hot!, mains voltage can sag and surge rather more than some keyboards can handle.
Have you tried repeating the recording....... do you get the same weirdness every time, or was it a one-time gremlin?
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An arranger is just a tool. What matters is what you build with it..!